Box for 2 15" L7s

I'm thinking about buying a couple 15" L7's, but I want to figure out a box design before I get the subs. Once I have the subs, I'll probably rush through the box design just to get the subs in there.

I measured my trunk yesterday and I came up with this design:
There will be another sub on other side, I was using that Google Sketchup program and it was a PITA to use.
The arms for the trunk lid limit the width in the back to 35" so I had to shape the box like that.
I'm still working on the port area/length calculations. I just wanted to make sure the overall design is ok?

Re: Box for 2 15" L7s

Well after some more measuring, it turns out that I only have 33" to work with if I want the subs to face the rear of the trunk. Which doesnt leave any room for the ports. I was kinda thinking of doing something like in the pic.